WATERTOWN, Mass.--(BUSINESS WIRE)--Enanta Pharmaceuticals, Inc., (NASDAQ: ENTA), a research and development-focused biotechnology company dedicated to creating small molecule drugs in the infectious disease field, today announced that AbbVie’s investigational direct-acting antiviral (DAA) combination regimen with and without ribavirin for the treatment of genotype 1 (GT1) hepatitis C virus (HCV) infection has been designated as a Breakthrough Therapy by the U.S. Food and Drug Administration (FDA). ABT-450, Enanta’s lead HCV protease inhibitor identified in its ongoing collaboration with AbbVie, is one of three DAAs in the regimen.